Error Compiling for Ubuntu

I tried to compile this on Ubuntu 14.04 and got an error, anybody know how to fix it?

./configure –with-ssl=/usr/bin/openssl –with-ssl-lib=/usr/lib/x86_64-linux-gnu –prefix=/etc/nagios3 –enable-command-args

make all
gcc -g -O2 -I/usr/include/openssl -DHAVE_CONFIG_H -I ../include -I ./../include -o nrpe ./nrpe.c ./utils.c ./acl.c -L/usr/lib/x86_64-linux-gnu -lssl -lcrypto -lnsl
./nrpe.c: In function ‘init_ssl’:
./nrpe.c:319:9: warning: format ‘%s’ expects argument of type ‘char *’, but argument 4 has type ‘int’ [-Wformat=]
sslprm.cert_file, ERR_error_string(x, NULL));
^
./nrpe.c: In function ‘handle_conn_ssl’:
./nrpe.c:1754:9: warning: format ‘%s’ expects argument of type ‘char *’, but argument 4 has type ‘int’ [-Wformat=]
remote_host, ERR_reason_error_string(x));
^
./nrpe.c: In function ‘main’:
./nrpe.c:168:9: warning: ignoring return value of ‘getcwd’, declared with attribute warn_unused_result [-Wunused-result]
getcwd(config_file, sizeof(config_file));
^
./nrpe.c: In function ‘set_stdio_sigs’:
./nrpe.c:553:7: warning: ignoring return value of ‘chdir’, declared with attribute warn_unused_result [-Wunused-result]
chdir(“/”);
^
./nrpe.c: In function ‘my_system’:
./nrpe.c:1994:6: warning: ignoring return value of ‘pipe’, declared with attribute warn_unused_result [-Wunused-result]
pipe(fd); /* create a pipe */
^
In file included from ./nrpe.c:27:0:
../include/config.h:110:28: warning: ignoring return value of ‘seteuid’, declared with attribute warn_unused_result [-Wunused-result]
#define SETEUID(id) seteuid(id)
^
./nrpe.c:2026:3: note: in expansion of macro ‘SETEUID’
SETEUID(0); /* get root back so the next call works correctly */
^
./nrpe.c:2050:9: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(fd[1], buffer, strlen(buffer) + 1);
^
./nrpe.c:2058:10: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(fd[1], buffer, bytes_read);
^
./nrpe.c:2061:9: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(fd[1], “”, 1);
^
./nrpe.c: In function ‘write_pid_file’:
./nrpe.c:2267:8: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(fd, pbuf, strlen(pbuf));
^
In file included from ./nrpe.c:27:0:
./nrpe.c: In function ‘remove_pid_file’:
../include/config.h:110:28: warning: ignoring return value of ‘seteuid’, declared with attribute warn_unused_result [-Wunused-result]
#define SETEUID(id) seteuid(id)
^
./nrpe.c:2286:2: note: in expansion of macro ‘SETEUID’
SETEUID(0); /* get root back so we can delete the pid file */
^
gcc -g -O2 -I/usr/include/openssl -DHAVE_CONFIG_H -I ../include -I ./../include -o check_nrpe ./check_nrpe.c ./utils.c -L/usr/lib/x86_64-linux-gnu -lssl -lcrypto -lnsl
./check_nrpe.c: In function ‘connect_to_remote’:
./check_nrpe.c:926:9: warning: format ‘%s’ expects argument of type ‘char *’, but argument 4 has type ‘int’ [-Wformat=]
rem_host, ERR_reason_error_string(x));
^
./check_nrpe.c: In function ‘alarm_handler’:
./check_nrpe.c:1457:7: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(STDOUT_FILENO, msg1, sizeof(msg1) – 1);
^
./check_nrpe.c:1458:7: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(STDOUT_FILENO, text, lth1);
^
./check_nrpe.c:1459:7: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(STDOUT_FILENO, msg2, sizeof(msg2) – 1);
^
./check_nrpe.c:1460:7: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(STDOUT_FILENO, timeout_txt, lth2);
^
./check_nrpe.c:1461:7: warning: ignoring return value of ‘write’, declared with attribute warn_unused_result [-Wunused-result]
write(STDOUT_FILENO, msg3, sizeof(msg3) – 1);